what controls are most effective in avoiding a "busybody" in the organization accessing this information?

Trusting those in charge in hiring the best people and even there, some good people are naturally curious.. If you can't trust management then your no worse off than if you trusted your own feelings. It happens, we can't control it 100%.. [ Do not get involved if you have a bad feeling about it and have he anything particularly damaging about yourself.Aside from this explanation employees are

forced to beat one of their colleagues to death each week until morale and busy bodiness improves. ]